1. Department of Orthopaedic Surgery, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea.
2. Department of Orthopaedic Surgery, Uijeongbu St. Mary’s Hospital, The Catholic University of Korea College of Medicine, Uijeongbu, Korea.
3. Department of Orthopaedic Surgery, Hanyang University Hospital, Hanyang University College of Medicine, Seoul, Korea.